I had multiple problems too. Apparently forums everywhere people are reporting issues.
I had sensor #2 fail - they replaced it.
Then my PMUP went bad - had it replaced.
Working now for 2 weeks -s that is good.
I think if I ever have my sensors replaced I might put some silicone on the back of it where the wire enters the sensor. I did this with my old DIY float switch ATO that ran for 8 years. It may be a point of failure.
The PMUP might be a bad design - so if it fails again (if I reach outside of my warranty period) I'll just rig up a different pump. But then essentially I'd be only using the ATK for the optical sensor.
It is frustrating - thousands of dollars spent on the Apex system - pretty happy over the 8/9 years I've had it - but has not been a smooth experience for the ATK.
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